<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>无标题文档</title> 
<script language="javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> 
<script language="javascript"> 
$(function(){ 
var offsetX=20-$("#imgtest").offset().left; 
var offsetY=20-$("#imgtest").offset().top; 
var size=1.2*$('#imgtest ul li img').width(); 
$("#imgtest ul li").mouseover(function(event) { 
var $target=$(event.target); 
if($target.is('img')) 
{ 
$("<img id='tip' src='"+$target.attr("src")+"'>").css({ 
"height":size, 
"width":size, 
"top":event.pageX+offsetX, 
"left":event.pageY+offsetY, 
}).appendTo($("#imgtest")); 
} 
}).mouseout(function() { 
$("#tip").remove(); 
}).mousemove(function(event) { 
$("#tip").css( 
{ 
"left":event.pageX+offsetX, 
"top":event.pageY+offsetY 
}); 
}); 
}) 
</script> 
<style type="text/css"> 
img{ height:262px; width:400px; position:absolute; border:5px solid #FFF;} 
#imgtest{ height:auto;width:840px; margin:0 auto; position:absolute; } 
#imgtest ul{ position:relative;width:840px; height:auto; background:#00F;} 
#imgtest ul li{ position:relative; height:276px; width:410px; list-style:none; float:left; margin:3px; border:1px solid #999;} 
</style> 
</head> 
<body> 
<div id="imgtest"> 
<ul> 
<li><img src="http://www.wgglife.com/wp-content/uploads/2015/10/142987277416.jpg" /></li> 
<li><img src="http://www.wgglife.com/wp-content/uploads/2015/10/142987277416.jpg" /></li> 
<li><img src="http://www.wgglife.com/wp-content/uploads/2015/10/142987277416.jpg" /></li> 
<li><img src="http://www.wgglife.com/wp-content/uploads/2015/10/142987277416.jpg" /></li> 
</ul> 
</div> 
</body> 
</html> 